Mixer tap for a kitchen sink



FIG. 1 is a perspective view of the top, front and right side of a mixer tap for a kitchen sink showing our new design;

FIG. 2 is a front elevational view thereof;

FIG. 3 is a left side view thereof; and,

FIG. 4 is a top plan view thereof.

The trade name appearing in FIG. 1 forms no part of the claimed design. 

The ornamental design for a mixer tap for a kitchen sink, as shown and described. 